At layers 2/3 you can do Multilink PPP or even something wierd and questionably reliable like LACP over Ethernet-over-IP over the individual connections, but given that it's only 500m and you control both ends the best solution would likely be at http://www.netsys-direct.com/Ethernet_Extenders_s/1814.htm , particularly  http://www.netsys-direct.com/product_p/nv-600ekit.htm

On Tue, Sep 29, 2015 at 4:18 AM, Trevor Cordes <trevor@tecnopolis.ca> wrote:
Is it possible to aggregate DSL lines, to combine them to get X-times the
bandwidth on a single link?  In this situation, I control both ends, the
DSLAM and the DSL modem side on the other end of some POTS runs (CAT3-ish
I assume, or worse).

Note, I don't want load balancing or fancy routing/sharing.  I need double
(or more) the bandwidth for a single application (single TCP connection).

If required, we can have linux/bsd boxes we control at either end of the
links.

If it's not possible, does anyone have any other ideas for somehow getting
better bandwidth out of 500m POTS wires (quantity 4)?

Thanks!
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